<div class="page-container" v-cloak>
    <el-card>
        <template #header>
            <div class="breadcrumb">
                <el-breadcrumb separator="/">
                    <el-breadcrumb-item>demo</el-breadcrumb-item>
                </el-breadcrumb>
            </div>
        </template>
        <div>
            hello demo {$msg}
        </div>
    </el-card>
</div>

<script>
    const App = {
        data() {
            return {}
        },
        mounted() {
        },
        methods: {}
    }
</script>